---
title: Dual Gas Trace CO and CO2 Analyser | Sarvesh
url: https://www.sarveshanalytics.com/trace-co-and-co2-analyser.html
description: ACCURRA-S dual-gas analyser for ppm CO and ppm CO2 in nitrogen, argon and helium, for gas purity checks and certification.
updated: 2026-11-03
source: html
---

ACCURRA-S dual channel

# Dual-gas trace CO and CO2 analyser for nitrogen, argon and helium

A dual-gas ACCURRA-S measures ppm CO and ppm CO2 in nitrogen, argon and helium, for gas purity and certification.

- ISO 9001:2015, certified by TÜV
- Designed and built in Pune since 2002
- Supplied to Reliance, Tata Steel, Indian Oil, Linde and ISRO

 Quick answer

A dual-gas ACCURRA-S measures ppm CO (0 to 1000 ppm, model 2015) and ppm CO2 (0 to 5000 ppm, model 6015) in nitrogen, argon and helium, for gas purity checks and certification, with independent outputs for each channel.

Updated 3 November 2026 · Figures from Sarvesh datasheets

## Specifications

| Item | Specification | Notes |
|---|---|---|
| CO | 0 to 1000 ppm | Electrochemical, model 2015 |
| CO2 | 0 to 5000 ppm | NDIR, model 6015 |
| Independence | Own electronics, outputs, relays and Modbus ID per channel |  |

From the current Sarvesh product datasheets and company profile. Specifications may change without notice as products improve. The final responsibility to check that a product meets the process and analyser requirement remains with the customer.

## Key features

- Independent electronics, microcontroller, 4-20 mA, relays and Modbus ID per sensor
- Common pneumatics and one fine filter
- Calibration history and password protection

## How it works

Carbon monoxide and carbon dioxide are common impurities in inert gases and in gases made from combustion or fermentation sources. Purity grades set limits for both, so they are checked together at the filling manifold.

One enclosure reads both in ppm from the same sample, with independent outputs.

Both channels have long calibration intervals and keep their own calibration history. The sample should be dry and free of oil, and span gases for CO and CO2 are used to calibrate each channel across its range.

## Requirements and limits

- Safe-area analyser; the standard sample specification applies.

## Selection guidance

See the dual-gas analyser page for the full list of combinations.

## Applications

Application pages where this is part of the recommended solution:

- [Gas purity certification and cylinder filling](https://www.sarveshanalytics.com/applications/gas-purity-certification-and-cylinder-filling.html)
- [Semiconductor and electronics gas purity](https://www.sarveshanalytics.com/applications/semiconductor-and-electronics-gas-purity.html)

## Compatible products

[

### ACCURRA-S

Online analyser for trace, percent and purity O2, CO, CO2, CH4 and dew point; can measure two gases from one sample. View ACCURRA-S

](https://www.sarveshanalytics.com/safe-gas-analyser.html)[

### Headline filters

Particulate, coalescing and PTFE membrane filters from Headline Filters, UK, for analyser protection. View Headline filters

](https://www.sarveshanalytics.com/headline-filters.html)

## Frequently asked questions

**What ranges?**

CO 0 to 1000 ppm, CO2 0 to 5000 ppm.

**Which backgrounds?**

Nitrogen, argon and helium.

**What sensors?**

Electrochemical for CO and NDIR for CO2.

**Does it need a reference gas?**

Not for the measurement; calibrate with span gas.

## Related pages

- [Dual-gas analysers](https://www.sarveshanalytics.com/dual-gas-analyser.html)
- [Dual gas CO and CO2 (percent)](https://www.sarveshanalytics.com/co-and-co2-analyser.html)
- [Dual gas CO2 and CH4 (percent)](https://www.sarveshanalytics.com/co2-and-ch4-analyser.html)
- [Dual gas O2 and CO2 (percent)](https://www.sarveshanalytics.com/o2-and-co2-analyser.html)
- [Dual gas trace oxygen and moisture](https://www.sarveshanalytics.com/trace-oxygen-and-moisture-analyser.html)
- [**Browse all gas analysers**](https://www.sarveshanalytics.com/gas-analyser.html)